MBE2101 Thermo and Fluid Dynamics
Heat Transfer Lecture 2
Forced and Natural Convections
Instructor: Wenzhong Zhou, Ph.D.
Department of Mechanical and Biomedical Engineering
City University of Hong Kong
November 9, 2016
To Be The Best, To Educate The Best

MBE2101: Thermo and Fluid Dynamics (2016-17)
Thermodynamics
Assignment 3
1. Consider a device with one inlet and one outlet. If the volume flow rates at the inlet and at the
outlet are the same, is the flow through this device necessarily steady? Why?
No,

MBE2101: Thermo and Fluid Dynamics (2016-17)
Fluid Mechanics
Assignment 3
1. Express the Bernoulli equation in three different ways using (a) energies, (b) pressures, and (c)
heads. What are the three major assumptions used in the derivation of the Bernou

MBE2101: Thermo and Fluid Dynamics (2016-17)
Thermodynamics
Assignment 2
1. A propane tank is filled with a mixture of liquid and vapor propane. Can the contents of this
tank be considered a pure substance? Explain.
Answer:
Yes, since the chemical composi

MBE2101: Thermo and Fluid Dynamics (2016-17)
Fluid Mechanics
Assignment 3
1. What is the physical significance of the Reynolds number? How is it defined for (a) flow in a
circular pipe of inner diameter D and (b) flow in a rectangular duct of cross sectio

MBE2101: Thermo and Fluid Dynamics (2016-17)
Thermodynamics
Assignment 3
1. Consider a device with one inlet and one outlet. If the volume flow rates at the inlet and at the
outlet are the same, is the flow through this device necessarily steady? Why?
2.

MBE2101: Thermo and Fluid Dynamics (2016-17)
Heat Transfer
Assignment 1
1. Write down the expressions for the physical laws that govern each mode of heat transfer, and
identify the variables involved in each relation.
Conduction is expressed by Fourier's

MBE2101: Thermo and Fluid Dynamics (2016-17)
Thermodynamics
Assignment 4
1. The entropy of a hot baked potato decreases as it cools. Is this a violation of the increase of
entropy principle? Explain.
2. The entropy of the working fluid of the ideal Carnot

MBE2101: Thermo and Fluid Dynamics (2016-17)
Fluid Mechanics
Assignment 4
1. What is drag? What causes it? Why do we usually try to minimize it? What is lift? What
causes it? Does wall shear contribute to the lift?
2. During flow over a given body, the dr

MBE2101: Thermo and Fluid Dynamics (2016-17)
Heat Transfer
Assignment 2
1. Both the Nusselt number and the Biot number have the same form. What are the differences
between them in terms of the variables employed and their physical significance?
Both the B

MBE2101: Thermo and Fluid Dynamics (2016-17)
Thermodynamics
Assignment 1
1. What is the difference between the classical and the statistical approaches to thermodynamics?
Answer:
Classical thermodynamics is based on experimental observations whereas stati

MBE2101: Thermo and Fluid Dynamics (2016-17)
Heat Transfer
Assignment 2
1. Both the Nusselt number and the Biot number have the same form. What are the differences
between them in terms of the variables employed and their physical significance?
2. Write d

MBE2101 Thermo and Fluid Dynamics
Fluid Mechanics Lecture 5
Internal Flow
Instructor: Wenzhong Zhou, Ph.D.
Department of Mechanical and Biomedical Engineering
City University of Hong Kong
October 19, 2016
To Be The Best, To Educate The Best.
Objectives
H

MBE2101 Thermo and Fluid Dynamics
Fluid Mechanics Lecture 6
External flow: drag and lift
Instructor: Wenzhong Zhou, Ph.D.
Department of Mechanical and Biomedical Engineering
City University of Hong Kong
October 26, 2016
To Be The Best, To Educate The Best

MBE2101 Thermo and Fluid Dynamics
Fluid Mechanics Lecture 4
Momentum analysis of flow systems
Instructor: Wenzhong Zhou, Ph.D.
Department of Mechanical and Biomedical Engineering
City University of Hong Kong
October 5, 2016
To Be The Best, To Educate The

MBE2101 Thermo and Fluid Dynamics
Fluid Mechanics Lecture 1
Introduction and properties of fluids
Instructor: Wenzhong Zhou, Ph.D.
Department of Mechanical and Biomedical Engineering
City University of Hong Kong
September 28, 2016
To Be The Best, To Educa

MBE2101: Thermo and Fluid Dynamics (2016-17)
Fluid Mechanics
Assignment 1
1. Define incompressible flow and incompressible fluid. Must the flow of a compressible fluid
necessarily be treated as compressible?
Answer:
A fluid flow during which the density o

MBE2101 Thermo and Fluid Dynamics
Heat Transfer Lecture 3
Heat Exchangers
Instructor: Wenzhong Zhou, Ph.D.
Department of Mechanical and Biomedical Engineering
City University of Hong Kong
November 16, 2016
To Be The Best, To Educate The Best.
Objectives

MBE2101 Thermo and Fluid Dynamics
Fluid Mechanics Lecture 3
Bernoulli and energy equations
Instructor: Wenzhong Zhou, Ph.D.
Department of Mechanical and Biomedical Engineering
City University of Hong Kong
October 5, 2016
To Be The Best, To Educate The Bes

MBE2101 Thermo and Fluid Dynamics
Fluid Mechanics Lecture 2
Fluid statics
Instructor: Wenzhong Zhou, Ph.D.
Department of Mechanical and Biomedical Engineering
City University of Hong Kong
September 28, 2016
To Be The Best, To Educate The Best.
Objectives

MBE2101: Thermo and Fluid Dynamics (2016-17)
Fluid Mechanics
Assignment 4
1. What is drag? What causes it? Why do we usually try to minimize it? What is lift? What
causes it? Does wall shear contribute to the lift?
Answer:
The force a flowing fluid exerts

MBE2101: Thermo and Fluid Dynamics (2016-17)
Heat Transfer
Assignment 3
1. A finned-tube, cross flow heat exchanger is to use the exhaust of a gas turbine to heat
pressurized water. Laboratory measurements are performed on a prototype version of the
excha

MBE2101: Thermo and Fluid Dynamics (2016-17)
Thermodynamics
Assignment 2
1. A propane tank is filled with a mixture of liquid and vapor propane. Can the contents of this
tank be considered a pure substance? Explain.
2. What is the difference between the s

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Budgeted Selling price
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Nowadays, stress occurs to everyone and which can be found in everywhere.
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MBE2101: Thermo and Fluid Dynamics (2013-14)
Thermodynamics
Assignment 3
1. Is the energy required to heat air from 295 to 305 K the same as the energy required to heat it
from 345 to 355 K? Assume the pressure remains constant in both cases.
Answer:
Very

MBE2101: Thermo and Fluid Dynamics (2013-14)
Thermodynamics
Assignment 1
1. What is the difference between the classical and the statistical approaches to thermodynamics?
Answer:
Classical thermodynamics is based on experimental observations whereas stati

MBE2101: Thermo and Fluid Dynamics (2013-14)
Heat Transfer
Assignment 2
1. Both the Nusselt number and the Biot number have the same form. What are the differences
between them in terms of the variables employed and their physical significance?
Both the B

MBE2101: Thermo and Fluid Dynamics (2013-14)
Heat Transfer
Assignment 1
1. Write down the expressions for the physical laws that govern each mode of heat transfer, and
identify the variables involved in each relation.
Conduction is expressed by Fourier's